Make mapping relationship to three table using EF CodeFirst

Question

I am student developer at C#. I have a question while making relationship to 3 tables. My tables are like this.

 public class ImdbContext : DbContext
    {
        public DbSet<Cast> Cast { get; set; }
        public DbSet<CastRole> CastRole { get; set; }
        public DbSet<Movie> Movie { get; set; }
        public DbSet<MovieCastRoleMapping> MovieCastRoleMapping { get; set; }

        public ImdbContext() : base("ImdbDbContext")
        {
        }
    }

    [Table("Movies")]
    public class Movie
    {
        [Key]
        public int movieId { get; set; }
        public string movieName { get; set; }
        public string movieYear { get; set; }
        public string movieLink { get; set; }
        public string movieImageUrl { get; set; }
        public virtual MovieCastRoleMapping MovieCastRoleMapping { get; set; }
    }
    [Table("CastRoles")]
    public class CastRole
    {
        [Key]
        public int castRoleId { get; set; }
        public string castRoleName { get; set; }

        public virtual MovieCastRoleMapping MovieCastRoleMapping { get; set; }
    }
    [Table("Casts")]
    public class Cast
    {
        [Key]
        public int castId { get; set; }
        public string nameSurname { get; set; }
        public string biography   { get; set; }

        public virtual MovieCastRoleMapping MovieCastRoleMapping { get; set; }

    }

I did not find a clear solution to make correct relation for 3 tables. When I tried to make it myself, I facing an eror like this:

The ForeignKeyAttribute on property 'fkCastId' on type 'ImdbEntity.Models.MovieCastRoleMapping' is not valid. The navigation property 'castId' was not found on the dependent type 'ImdbEntity.Models.MovieCastRoleMapping'. The Name value should be a valid navigation property name.

I know I need to set navigation property. Untill now, I was using EF DbFirst but I want to make it EF CodeFirst without using a diagram. Could you help me for fallowing class correctly ?

[Table("MovieCastRoleMappings")]
public class MovieCastRoleMapping
{
    [ForeignKey("castId")]
    public int fkCastId { get; set; }
    [ForeignKey("castRoleId")]
    public int fkCastRoleId { get; set; }
    [ForeignKey("movieId")]
    public int fkMovieId { get; set; }
}

Answer 1

public class ImdbContext : DbContext
{
    public DbSet<Cast> Cast { get; set; }
    public DbSet<CastRole> CastRole { get; set; }
    public DbSet<Movie> Movie { get; set; }
    public DbSet<MovieCastRoleMapping> MovieCastRoleMapping { get; set; }

    public ImdbContext() : base("ImdbDbContext")
    {
    }
}

[Table("Movies")]
public class Movie
{
    [Key]
    public int movieId { get; set; }
    public string movieName { get; set; }
    public string movieYear { get; set; }
    public string movieLink { get; set; }
    public string movieImageUrl { get; set; }
}

[Table("CastRoles")]
    public class CastRole
    {
        [Key]
        public int castRoleId { get; set; }
        public string castRoleName { get; set; }   
    }

[Table("Casts")]
public class Cast
{
    [Key]
    public int castId { get; set; }
    public string nameSurname { get; set; }
    public string biography   { get; set; }
}

[Table("MovieCastRoleMappings")]
public class MovieCastRoleMapping
{
    [Key, Column(Order = 1)]
    public int fkCastId { get; set; }
    [ForeignKey("fkCastId")]
    public virtual Cast Cast { get; set; }

    [Key, Column(Order = 2)]
    public int fkCastRoleId { get; set; }
    [ForeignKey("fkCastRoleId")]
    public virtual CastRole CastRole { get; set; }

    [Key, Column(Order = 3)]
    public int fkMovieId { get; set; }
    [ForeignKey("fkMovieId")]
    public virtual Movie Movie { get; set; }
}

That's for the solution. Thanks for your interesting.